The body is thrown down from a height of 35 m with a velocity of 12 m/s which is assumed to be in the downward direction. On a freely falling body there is an acceleration due to the gravitational force of attraction of the Earth in the downward direction. This is equal to 9.8 m/s^2.

For a body that has an initial velocity of u, travels for s meters under an acceleration a and has a final velocity v, the relation between all the variables is v^2 - u^2 = 2*a*s or v^2 = u^2 + 2*a*s.